F91.3Oppositional defiant disorder
Code usage status
Primary diagnosis
May be used as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter V
- Mental and behavioural disorders
- Group F90-F98
- Behavioural and emotional disorders with onset usually occurring in childhood and adolescence
- Official Vietnamese name
- Rối loạn chống đối
- Additional WHO coding guidance
- Conduct disorder, usually occurring in younger children, primarily characterized by markedly defiant, disobedient, disruptive behaviour that does not include delinquent acts or the more extreme forms of aggressive or dissocial behaviour. The disorder requires that the overall criteria for F91.- be met; even severely mischievous or naughty behaviour is not in itself sufficient for diagnosis. Caution should be employed before using this category, especially with older children, because clinically significant conduct disorder will usually be accompanied by dissocial or aggressive behaviour that goes beyond mere defiance,
Related F91 codes
F91
Conduct disorders
F91.0
Primary diagnosis candidate
Conduct disorder confined to the family context
F91.1
Primary diagnosis candidate
Unsocialized conduct disorder
F91.2
Primary diagnosis candidate
Socialized conduct disorder
F91.8
Primary diagnosis candidate
Other conduct disorders
F91.9
Primary diagnosis candidate
Conduct disorder, unspecified
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
